[socks-proxy-agent] pass socket_options to SocksClient

[lukekarrys]

This PR adds the option socketOptions which will get passed along to SocksClient.createConnection as socket_options.

Another solution would be to spread all the unused constructor options to the SocksClient.createConnection options since there are a few more that are allowed. I didn't go this route since I only have a use case for socket_options and I didn't want to couple the two APIs too closely. But I'd be happy to rework this PR if desired.

For reference the SocksClientOptions interface is:

interface SocksClientOptions {
    command: SocksCommandOption;
    destination: SocksRemoteHost;
    proxy: SocksProxy;
    timeout?: number;
    existing_socket?: Duplex;
    set_tcp_nodelay?: boolean;
    socket_options?: SocketConnectOpts;
}

[changeset-bot]

🦋 Changeset detected

Latest commit: 3586919

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
socks-proxy-agent	Patch

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Name	Status	Preview	Updated (UTC)
proxy-agents	✅ Ready (Inspect)	Visit Preview	Mar 30, 2024 1:08am

[melroy89]

CI/CD fails, due to too many socket connections or.. ? 😆

 
  FAIL test/e2e.test.ts (32.526 s)
    HttpsProxyAgent
      ✕ should work over NordVPN proxy (30002 ms)
  
    ● HttpsProxyAgent › should work over NordVPN proxy
  
      thrown: "Exceeded timeout of 30000 ms for a test.
      Add a timeout value to this test to increase the timeout, if this is a long-running test. See https://jestjs.io/docs/api#testname-fn-timeout."
  
        49 |
        50 | describe('HttpsProxyAgent', () => {
      > 51 | 	it('should work over NordVPN proxy', async () => {
           | 	^
        52 | 		const { NORDVPN_USERNAME, NORDVPN_PASSWORD } = process.env;
        53 | 		if (!NORDVPN_USERNAME) {
        54 | 			throw new Error('`NORDVPN_USERNAME` env var is not defined');
  
        at test/e2e.test.ts:51:2
        at Object.<anonymous> (test/e2e.test.ts:50:1)